Public Meeting to Consider Approval of California's Emissions Inventory for Off-Road Large Compression-Ignited
Engines (>25hp) Using the New Off-Road Emissions Model

SUMMARY OF AGENDA ITEM:

The Board approved the proposed statewide, annual average, emissions inventory for off-road large compression-ignited
engines (CI) greater than or equal to 25 horsepower. California's off-road large CI engine inventory is an estimate
of the amounts and types of pollutants emitted from thousands of pieces of equipment with a rating of greater than
or equal to 25 horsepower, which are used in off-road applications such as agriculture, construction and industrial.
Most of the CI engines use diesel fuel.

ORAL TESTIMONY:

Michael Block

EMA

FORMAL BOARD ACTION: None.

RESPONSIBLE DIVISION: MSCD

STAFF REPORT: Yes (123 pages)

00-1-4

Public Hearing to Consider Amendments to Off-Road Compression-Ignition Engine Regulations: 2000 and Later Emission
Standards, Compliance Requirements and Test Procedures

SUMMARY OF AGENDA ITEM:

The staff proposed amendments to the California regulations governing off-road compression-ignition (diesel) engines.
Previously, the Air Resources Board (Board) adopted exhaust emission standards and test procedures for engines
rated less than 25 horsepower in 1990 and for engines rated 175 horsepower and greater in 1992.

The 1994 State Implementation Plan (SIP) for Ozone called for more stringent emission standards from these engines
in 2005. Due to federal preemption, a significant portion of these engines are exempt from California regulations.
Thus, U.S. EPA's cooperation became necessary in order to achieve the SIP-required emission reductions.

A Statement of Principles (SOP) was signed in 1996. The signatories included ARB, U.S. EPA, and industry. The SOP
outlined a harmonized, multi-tiered, emission-reduction scheme. Although the SOP did not meet the exhaust emission
standards envisioned in the SIP, its earlier implementation dates achieved equivalent results.

The Board approved the proposed amendments, which harmonize California's emission standards with U.S. EPA's emission
standards. The amendments consolidate compression-ignition engine power categories together in one Article in the
California Code of Regulations. Additionally, these engines will be subject to enforcement requirements, such as
Selective Enforcement Auditing, In-Use Compliance Testing, and Recall Provisions.